Drill-chuck.



No. 896,051. PATENTED AUG. 11, 1908.

F. M. ASHLEY.

DRILL OHUCK.

' APPLIGATIONIILED JAN. 6, 1906.

FRANK M. ASHLEY, OF NEW YORK, N. Y.

DRILL-CHUCK.

Specification of Letters Patent.

Patented Aug. 11, 1908.

Application filed January 6, 1906. Serial No. 294,877.

To all whom it may concern:

Be it known that I, FRANK M. AsHLEY, a citizen of the United States, andresident of New York city, in the county of New York and State of NewYork, have invented certain new and useful Im rovements in Drill-Chucks, of which the fol owing is a specification.

My invention relates to drill chucks and particularly to that type inwhich the jaw members move at an incline to the axis of the chuck.

The object of the invention is the production of a chuck of thetype'referred to, which will not only be of simple construction andconvenient of manipulation, but will at the same time be extremelydurable and highly efficient in use.

WVith the above and other purposes in view, the novel chuck 1n the formdisclosed herein comprises a body contamlng guideways for the jawmembers, said guideways being at an inclination to the axis of the chuckand open at the periphery of the rear portion of the body but extendingbelow the surface of the body at the forward portion thereof, saidforward portion being externally threaded and presenting a shoulderagainst which latter a ring bears when engaged with the body threads,the ring serving in connection with a limiting stop on the rear portionof said body to confine a revoluble sleeve on said rear portion, saidsleeve being in one piece and having integral threads engaging withthose of the j aw members in the guideways. By this arrangement, thering has a positive bearing on and firm connection with the body, whilethe configurations of the ring interior and the exterior of the forwardportion of the body are such that the ring so reinforces the metal atthe closed tops of the guideways against lateral thrust incurred by thejaw members, that the ring cooperates with the forward portion of thebody to provide a uniform thickness of metal to resist said lateralthrust throughout the closed parts of the guideways.

In the accompanying drawings forming part of this specification,-Figure1 is a longitudinal view, partly in section, of one form of my chuck,and illustrating the means used to hold the sleeve in operative positionon the chuck body. Fig. 2, is a central longitudinal sectional view on areduced scale, of the chuck body shown in Fig. 1. Fig. 3, is a crosssectional view of the chuck shown in the first figure, taken in a planethrough the center of the sleeve. Fig. 4, is a longitudinal view, partlyin section, disclosing a construction of the chuck wherein the sleeve isprovided with a rack at its forward end and the ring has provisionwhereby a pinion key'may be engaged to operate the sleeve.

Referring to Figs. 1 to 3, inclusive, A indicates the body of the chuckwhich is smallest in diameter at its front end and provided with threelongitudinally extending guideways G, equi-distant from each other andat an incline to' the axis of the chuck. Located in each of theseguideways, is the shank E of a member provided with a jaw E at its frontend. The jaw shanks are each provided with a thread E which engages witha thread B, formed in the interior surface of the sleeve B. The sleeveB, can be slipped on the front portion of the chuck body and manipulatedto fit in sliding engagement with the outer surface of the rear portionof the body, and the threaded part of each aw shank projects above theperiphery of the body to mesh with the thread B of the sleeve, so thatwhen the latter is rotated, the shanks will move in the guideways toopen or close the jaws in a manner well understood. The

rearward movement of the sleeve on the body, is determined by a limitingstop A, on the rear portion thereof. The retaining ring I, is screwed tothe forward portion of the body at I and coacts with the stop A, to holdthe sleeve B, in position and also serves as a reinforcement for thebody, when the jaws are under strain.

It will be noted that the forward portion of the body embodies anannular shoulder I which results in a forward section I and a section Iin different longitudinal planes as indicated, the section I of the morereduced diameter having a lain peripheral surface, while the corresponcing surface of the section I, is threaded. It will be observed thatwhile the rear portion of the body, with the exception of the stop A, isconical, the peripheral surfaces presented by the sections I I, areparallel. The presence of the shoulder I in connection with the planesoccupied by the peripheral surfaces of the sections I I, with respect tothe inclined guideways, results in a tapering reduction of the bodymetal above each guideway, in the direction of the rear of each of thesections I 1*, and this in itself would resent weak parts for resistingthe lateral thrust previously alluded to. Such difliculty is obviated byconfigurating the ring interior so that it closely conforms to theexterior of the forward portion of the body, and said ring is otherwiseso conditioned that the metal of the ring plus the body metal above eachguideway, will result in an amount of metal of uniform thicknesslongitudinally throughout the forward part (and as shown, to the rear)of each guideway, thus providing an adequate reinforce to cooperate inresisting lateral thrust.

Manifestly the retaining ring is the sole medium for maintaining thesleeve and jaw members in operative relation with respect to the chuckbody. Therefore, by detaching said ring, the chuck may be taken apartwithout trouble and without the use of tools.

In Fig. 4, the retaining ring I contains a socket bearing I within whichis engaged the end of a wrench, so that a pinion thereon will mesh witha rack D, on the front end of the sleeve B, to permit the latter to beoperated to close or open the jaws of the chuck as desired.

From the foregoing description, it will be appreciated that the purposesand advantages of the novel chuck, previously set forth in the statementof invention, are realized in a practical manner;

Having now described my invention, what I claim as new and desire tosecure by Letters Patent, is

1. A drill chuck comprising a body provided with guideways at aninclination to its axis, said guideways being open at the peripheralsurface of the rear portion of the body and extending beneath thesurface of the forward portion thereof, said forward portion havingexternally an annular shoulder to the rear of which is ring-engagingprovision, threaded jaw members in said guideways, a sleeve havingthreads meshing with those of the members, a separate sleeve retainingring overlying the forward portion of the body and conditioned to beheld in position by the engaging provision on said f0r-v ward portion,saidring having an internal shoulder firmly bearing against the shoulderof said portion.

2. A drill chuck comprising a body having a conical surface at its rearportion tapering forward, and a forward portion of less diameter thanthe small end of the conical portion, said body having convergingguideways opening laterally into the conical surface and extending belowthe surface of the forward portion in lines parallel with said conicalsurface, threaded jaws in said guideways, a threaded ring surroundingthe conical portion and engaging the threads of the jaws, and a sleevesecured on the forward portion and arranged to abut against the ring.

body and extending beneath the surface of the forward portion thereof,said body portion being tapered at its rear end and having its forwardend formed with parallel sides and provided with a thread, threaded jawmembers in said guideways, an integral sleeve having threads meshingwith those of the members, and a retaining ring having an internalthread engaging said thread formed on the body portion and abutting saidsleeve to maintain same in operable relation on said body portion.

4. A drill chuck comprising a body having a conical surface at its rearportion tapering forward, and a forward portion of less diameter thanthe small end of the conical portion, said body having convergingguideways opening laterally into the conical surface and extending belowthe surface of the for ward portion in lines parallel with sai' conicalsurface, said forward portion having parallel sides, threaded jaws insaid grideways, a threaded ring surrounding the conical portion andengaging the threads of the jaws, and a sleeve secured on the parallelsides of the forward portion and arranged to abut against the ring.

5. A drill chuck comprising a body having a conical surface at its rearportion tapering forward, and a forward portion of less diameter thanthe small end of the conical portion, said body having convergingguideways opening laterally into the conical surface and extending belowthe surface of the forward portion in lines parallel with said conicalsurface, the forward portion of said body having parallel sides and ofless diameter than said conical portion, having a thread formed thereon,and having a portion of still smaller diameter at its forward end,threaded jaws in said guideways, a threaded ring surrounding the conicalportion and engaging the threads of the jaws, and a sleeve having aninternal thread engaging the thread on said body portion and abuttingsaid ring and embracing said smaller parallel portion, for the purposeset forth.

Signed at New York in the county of New York and. State of New York this4th day of January A. D. 1906.

FRANK M. ASHLEY.

WVitnesses:

A. T. SCHARPS, A. M. LYNoH.

